Sky Watching: The Mystery of Double Rainbows [1]
Weather.com - Chrissy Warrilow, 5/14/13
Niagara Falls are seen with a double rainbow on October 8, 2006, from aboard the Maid of the Mist on the Niagara River. Under the rainbow the American Falls can be seen. (Photo by DON EMMERT/AFP/Getty Images)
Double rainbows: If the hope of one pot of gold isn't enough, sometimes Mother Nature gives us the opportunity to pursue two.
How They Form
The double-dose of atmospheric optimism [2] is a result of optical effects occurring in tandem.
More: Weather.com [3]